Chuck for crank handles



Bec. M, i928. 1,694,380'

c. c. HANSEN CHUCK FOR CRANK HANDLES Filed Oct. 5, 1927 0 application ofthe invention, v

Fatented ec., lll, 1928,.

arras ear criainiis o, HANSEN, or aas'roii,` rnitnsvnvania, assis-noa roiiisnnsoLL-aann ooiiiiaitv, or sanear CITY, Jnasnr, e coaronariori ornew critica Foa carinii iiiinnnns.

Application led October 5, l1927. Serial No. 224,164.

This invention relates to rock drills, butV more particularly to a chuckadapted to be attachedon the feed screw crank handle of yt-he drill inorder to enpeditethe operation of withdrawing the drill from the drillhole. y p

Other objects will be in part obviousaiid in part pointed outhereinafter.

In the drawings illustrating a practical Figure l is an eleva-ion partlyin section of the vrearward end ofV a rock drill illustrating the mannerin. which the feed screw of a roclr drill may be rotated by means of arotary power -inotor connected to the crank handle by a Chuckconstructed in accordance with the practice of the invention, Figure 2is a perspective view Vof the chuck,

`Figure 3 is a similar view of a modification of the invention, and fFigure d is a view similar to Figure l illustrating an application ofthe modified chuck.

Referring to thev drawings, A generally designates a drifter, only theback head l? and a portion of the cylinder C of which are shown forillustrative purposes. drifter A iii common with drills of this type isintended to be supported by a shell D of any suitable type which in turnmay be secured to a column or other support ina well 'known manner.yl`liel cylinder C has the usual feed screw lug 'l in which is disthelug E by a nut G. j v

Vvlithin the feed nut F aiefornied threads H for cooperation .with afeed screw J where by the drifter Amayv be actuated longitiby dinallyofA the shell D; A .bearing is pro-M vided for the rearward endof thefeed screw J in the form of aHci-oss head K supported by rods L whichmay be secured vto the. rearward end of the shell D in any suitablemanner. disposed on theV rods L to abut the rearward end of the shell Dand the front end of the cross head l Vfor spacing'the cross head withrespect tothe shell. j, rlhe usual Vineans vprovided for manipuiatingthe feed screw J Consists of a crank handle P threaded on rearwardproject-v ing threaded end Q of the feed screw el. Additional clampingmeans lare provided for preventing' unscrewing of the crank The posedarfeed screw nut F held in position inl Preferably spacers O are.

handle P from, the Vprojection :These means in the presentinstaiice'consists of a vbolt R which projects through the hub portion Sof the crank handle P and a nut T screwed on the bolt Rkto produce aclamping effect on the hub S. `The hub S jas is cus.- toniary maybeprovided `Awith a longitudinal lslot (not shown) Vto .enable the hubto be drawn tightly on the endl Q of the feed screw. l

ln accordance with the present invention, ineans` arefprovided forenabling the substitution of suitable power .devices for manual power torotate the feed screw J, par-y ticularly for rotating the feed screw inthe direction. necessary to retract the drifter ./r

' whenever it becomes necessary to substitute handle Pl' .v

Adjacent the sides of the inner surface V lare 'lateral walls X` whichare preferably so spaced with respect to each other as to sub-ystantially equal the width of rthe crank *han- .dle P. Thelaterallwa-lls X may be slidably placed over the butt end of the crankl) and may be vslidably removed therefron'i without the insertion orremoval of vbolts or other securing means which, in theoperativeposition of the chuck, is intended to extend slidably between"the walls X. The walls X are preferably united by a cylindrical end wall'Y shaped to conform substan ltially .to' the contour of the hub S ofthecranljhandle. j 0n the rearward end of the plate U is an integralprojection Zv exteriorly threaded. as

at b and having a socket c, in this instance.

a tapered socket, Vfor the reception of a correspondingly formedspindle(E carried by a power devicesuch as Va, rotary drill e. rThe spindle d,as yis customary, .has the usual. threaded portion whereon is threaded achuck g for connecting the spindle to a tool or other device .intendedto be rotated by the rotary drill e. rlhe chuck g of course is alsoprovided with internal .threads Farin its front end "and` these threadsengage' those of the projection .Z tov secure :the plate` U-to thespindle (l. f Y In order to enablethe plate U to be suit-y that theplate U will be properly centralized with the feed screw J, thusbringing the axis ot he spindle l in aXial alignment with that of theieed screw Jj The lateral walls X are provided with recesses of suitableproportions and shape to partly surround and engage the head of the boltR andl also the nut T. The recesses j may lie in the same transverseplane and of course may alsovary as to size, depending upon the lsize ofthe nut Tandthe head of the bolt R.

The modification shown in Figures 3 and 4 illustrates a chuck le'adapted to be applied to a crank handle o in which the clamping bolt Rextends through the outward portion of thehub S and on the side of thefeed screw J opposite to thatoi thejuncture of the hub S and Vthe crankportion of the crank handle o. The chuck 7c comprises a plate p ofgenerally rectangular form and integral side walls Q disposed laterallywith respect to the plate p. The walls Q may be suitably spaced withrespect to each other to permit the entrance of the crank handle o, therearward surface of which is intended to bear against an inner surface rof the plate p. Near one vend of the walls g are formed the recesses y"for engagement with the head of the bolt R and with the nut T to locatethe chuck le in a position necessary to maintain the spindle d in axialalignment with the feed screw J.

In the drawings only a few modifications which the invention may assumeare shown to illustrate the manner in which the inven tion may bemodified to accommodate various types of i feed` screw crank handles. tobe understood, however, that the invention is susceptible of stillfurther modification to vsuit the particular design of the crank handleto which the chuck maybe applied,

as well as such prominences, their form and u location,` whereby thechuck is centralized with respect to the feed screw. f

In'practice, the chuck may be disposed on the spindle d oftherrotarydrill e and maybe drawn thereon and secured rmly in positionby the chuck g threaded on the projection. The device; will then be inVreadiness for application to the crank handle particularly in .largedrilling operationspinwhich the time ordinarily expended, forretractinggthe drifter'by manualy rotation of vthe feed screw J .lowersthe total drilling in 1 a given periodof time considerably below whatmight otherwise be obtained.

It is` An idea of the amount of time which is thus consumed may bereadily formed when it is understood that the usual type'of drill steelused in drifters permit of onlya depth of two feet of drilling persteel. Thislimi- Vtation necessitates frequent changes of steel and aconsequent wastage of time equalling handle and for maintaining saidplatein operative posit-ion on the crank handle, and means on the plateadapted to be connected to the chuck of a'power device whereby the crankhandle and the element normally actuated thereby are rotated.

2. A chuck for crank handles, comprising a plate, means on the plate forengaging the sides of the crank handle, said means also engaging the`clamping screw of the crank handle to centralize the plate with respectto the element intendedto be rotated, and

means on the plate adapted to-'bef connected .to the chuck of a powerdevice whereby the crank handle and the element normally actuatedthereby are rotated.

3. VA chuck for crank handles, comprising a plate, lateral walls on theplate for engaging the sides of the crank handle,y said walls havingrecesses for the reception of the clamping screw of a crank handle Vtocentralize the plate with respect to the element intended to be rotated,and a projection on t-he plate threaded for connection with the chuck ofa power device whereby the crank Vhandle and -the element normallyactuated thereby are rotated. 1

Y 4t. A chuck for crank handles, comprising a plate, lateral walls onone side of the plate i `engaging the crankhandle, saidwalls havingrecesses forthe receptionV of a prominence on the crank handle tomaintain the plate in operative position with4 respect to the elementintended. to be rotated, and a pro` jection on the plate threadedeXteriorly for connection with the chuck of a power device whereby thecrank handle and the element .normally actuated thereby are rotated,said projection having a bore to receive the spindle of such powerdevice. l

In testimony whereof I have signed this specification. y,

' CHARLES C. HANSEN.

